- half-infinite programming
- half-integer
- half-integer weight
- half-integral
- half-interval
- half-interval search
- half-invariant
- half-life
- half-linear
- half-line (= half line)
- half-martingale
- half-module
- half-Moses circle
- half-neighborhood
- half-normal distribution
- half-open interval
- half-parameter
- half-period
- half-periodic solution
- half-period ratio
- half-plane (= half plane)
- half-plane of convergence
- half-plane of holomorphy
- half-product
- half-quasigroup